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Abstract:

The present invention concerns a method for controlling the interferences
generated by radio signals transferred by or to wireless
telecommunication devices of a wireless cellular telecommunication
network. The method comprises the steps of: forming at least one group
of wireless telecommunication devices, allocating at least one identifier
to each wireless telecommunication device of the group, the at least one
identifier, said as group identifier, being allocated to each wireless
telecommunication device of the group of wireless telecommunication
devices, the group identifier being intended to be transferred by each
wireless telecommunication device to mobile terminals in parallel with
another identifier, allocating the same parameters for controlling the
interferences generated by radio signals transferred to or by each
wireless telecommunication device of the group.

Claims:

1. Method for controlling the interferences generated by radio signals
transferred by or to wireless telecommunication devices of a wireless
cellular telecommunication network, characterised in that the method
comprises the steps of: forming at least one group of wireless
telecommunication devices, allocating at least one identifier to each
wireless telecommunication device of the group of wireless
telecommunication devices, the at least one identifier, said as group
identifier, being allocated to each wireless telecommunication device of
the group of wireless telecommunication devices, the group identifier
being intended to be transferred by each wireless telecommunication
device of the group of wireless telecommunication devices to mobile
terminals in parallel with another identifier which is not shared with
each wireless telecommunication device of the group of wireless
telecommunication devices, allocating the same parameters for controlling
the interferences generated by radio signals transferred to or by each
wireless telecommunication device of the group of wireless
telecommunication devices.

2. Method according to claim 1, characterised in that the group
identifier and the parameters for controlling the interferences generated
by radio signals form a couple of information, the couple of information
being intended for an uplink channel or for a downlink channel of the
wireless telecommunication device.

3. Method according to claim 1 or 2, characterised in that the method
comprises further steps of: receiving information representative of
interferences received by at least one mobile terminal and/or at least
one wireless telecommunication device and/or at least one base station,
determining, from the information representative of interferences, other
parameters for controlling the interferences generated by radio signals,
determining, from the other parameters for controlling the interferences
generated by radio signals, another group identifier to be allocated to
each wireless telecommunication device of at least a part of the group of
wireless telecommunication devices, transferring to the at least part of
the group of wireless telecommunication devices the other group
identifier and/or the other parameters for controlling the interferences
generated by radio signals.

4. Method according to any of the claims 1 to 3, characterised in that
the method is executed by a base station or a coordinator of the wireless
cellular telecommunication network.

5. Method for controlling the interferences generated by radio signals
transferred by or to wireless telecommunication devices of a wireless
cellular telecommunication network, characterised in that the method
comprises the steps executed by at least one wireless telecommunication
device of: obtaining a couple of information formed by a first identifier
of the wireless telecommunication device intended to be transferred by
the wireless telecommunication device base station to mobile terminals
and by parameters for controlling the interferences generated by radio
signals transferred by or to said wireless telecommunication device,
obtaining a second identifier of the wireless telecommunication device,
the second identifier being intended to be transferred by the wireless
telecommunication device, transferring the first and second identifiers
to mobile terminals, transferring radio signals according to the
parameters for controlling the interferences generated by radio signals
or transferring a message to at least one mobile terminal, the message
comprising information related to the parameters for controlling the
interferences generated by radio signals transferred by the at least one
mobile terminal.

6. Method according to claim 5, characterised in that the couple of
information is intended for an uplink channel or for a downlink channel
of the wireless telecommunication device.

7. Method according to claim 6, characterised in that the first
identifier of the wireless telecommunication device and/or the parameters
for controlling the interferences generated by radio signals transferred
or received by the wireless telecommunication device is obtained from a
message transferred by a coordinator of the wireless cellular
telecommunication network.

8. Method according to claim 6, characterised in that the identifier of
the wireless telecommunication device and/or the parameters for
controlling the interferences generated by radio signals transferred or
received by the wireless telecommunication device is obtained from a
message transferred by a base station of the wireless cellular
telecommunication network.

9. Method according to claim 6, characterised in that at least two
couples of information are allocated to the wireless telecommunication
device by at least two different telecommunication devices and in that
the method further comprises the steps of: selecting at least one of the
received couples of information, transferring at least the identifier of
the at least one selected couple of information to mobile terminals,
transferring radio signals according to one received set of parameters or
to a set of parameters derived from the at least two sets of parameters
of the received couples of information or transferring a message to at
least one mobile terminal comprising information related to one received
set of parameters or to a set of parameters derived from the at least two
sets of parameters of the received couples of information.

10. Device for controlling the interferences generated by radio signals
transferred by or to wireless telecommunication devices of a wireless
cellular telecommunication network, characterised in that the device for
controlling the interferences comprises: means for forming at least one
group of wireless telecommunication devices, means for allocating at
least one identifier to each wireless telecommunication device of the
group of wireless telecommunication devices, the at least one identifier,
said as group identifier, being allocated to each wireless
telecommunication device of the group of wireless telecommunication
devices, the group identifier being intended to be transferred by each
wireless telecommunication device of the group of wireless
telecommunication devices to mobile terminals in parallel with another
identifier which is not shared with each wireless telecommunication
device of the group of wireless telecommunication devices, means for
allocating the same parameters for controlling the interferences
generated by radio signals transferred to or by each wireless
telecommunication device of the group of wireless telecommunication
devices.

11. Device for controlling the interferences generated by radio signals
transferred by or to wireless telecommunication devices of a wireless
cellular telecommunication network, characterised in that the device for
controlling the interferences is included in a wireless telecommunication
device and comprises: means for obtaining a couple of information formed
by a first identifier of the wireless telecommunication device intended
to be transferred by the wireless telecommunication device base station
to mobile terminals and by parameters for controlling the interferences
generated by radio signals transferred by or to wireless
telecommunication device, means for obtaining a second identifier of the
wireless telecommunication device, the second identifier being intended
to be transferred by the wireless telecommunication device, means for
transferring the first and second identifiers to mobile terminals, means
for transferring radio signals according to the parameters for
controlling the interference generated by radio signals or transferring a
message to at least one mobile terminal, the message comprising
information related to the parameters for controlling the interference
generated by radio signals transferred by the at least one mobile
terminal.

12. Computer program which can be directly loadable into a programmable
device, comprising instructions or portions of code for implementing the
steps of the method according to claims 1 to 4, when said computer
program is executed on a programmable device.

13. Computer program which can be directly loadable into a programmable
device, comprising instructions or portions of code for implementing the
steps of the method according to claims 5 to 9, when said computer
program is executed on a programmable device.

Description:

[0001] The present invention relates generally to a method and a device
for controlling the interferences generated by radio signals transferred
by or to wireless telecommunication devices of a wireless cellular
telecommunication network.

[0002] In order to avoid interferences generated by base stations and
mobile terminals, inter-cell interference coordination (ICIC) techniques
have been developed.

[0003] Classically, a mobile terminal reports to the base station the
mobile terminal is currently served by, the interference it receives from
neighbouring base stations. The base station also estimates the
interference it experiences from mobile terminals served by neighbouring
base stations. Base stations also exchange messages between each other in
order to perform an efficient ICIC.

[0004] Without shadowing, the interference level depends on the distance
separating the base stations. The higher the distance between base
stations is, the lower the interference is. It also depends on their
respective transmit powers.

[0005] With shadowing, the interference level is not only related to the
distance between the base stations and their respective transmit powers.
The interference also depends on the shadowing between each mobile
terminal and the two base stations.

[0006] In classic wireless cellular telecommunication networks, each base
station has an identifier like a physical cell identity (PCID) for each
of its cells or each sector of its cell or cells. The PCID characterises
a cell or sector of the base station in the physical layer.

[0007] For example, the PCID is associated to two sequences, a first
sequence named PSC sequence or Primary Synchronisation Signal (PSS) is
transferred in the Primary Synchronisation Channel (PSC) and a second
sequence named SSC sequence or Secondary Synchronisation Signal (SSS) is
transferred in the Secondary Synchronisation Channel (SSC).

[0008] For example, three PSC sequences are available in the wireless
cellular telecommunication network, each having good time
auto-correlation properties.

[0009] For example, in addition to PCID identification, the PSC sequences
may be used for rough synchronisation and for channel estimation enabling
coherent detection of the SSC sequence. In addition to PCID
identification, the SSC sequences may be used for synchronisation
refinement.

[0010] For example, the three PSC sequences are quasi-orthogonal in order
to ensure efficient time synchronisation for three different synchronised
cells.

[0011] For example, hundred sixty eight SSC sequences are available in the
wireless cellular telecommunication network, each having low
cross-correlation with other SSC sequences.

[0012] According to the aforementioned example, the total number of PCIDs
is then equal to five hundred and four.

[0013] Today, wireless cellular telecommunication networks are largely
deployed but there are still some areas not covered by the base stations
of the wireless cellular telecommunication network.

[0014] The access to the wireless cellular telecommunication network might
not be possible for a mobile terminal located in a building, if the
signals radiated by the base stations are too attenuated.

[0015] Solutions are proposed today. Particular wireless telecommunication
devices, like home base stations or femto base stations or pico base
stations, provide coverage areas at least within the buildings. Relays
are also considered.

[0016] Home base stations may enable a limited number of mobile terminals
to access the wireless cellular telecommunication network through their
respective resources.

[0017] Relays rely on signals transferred by base stations and/or signals
they transfer to a base station to enable a limited number of mobile
terminals to access the wireless cellular telecommunication network
through their respective resources.

[0018] For example, relays are wireless telecommunication devices which
transmit their own signal as if they were base stations or home base
stations. Mobile terminals communicate with these relays as if they were
base stations or home base stations. However, unlike a base station or a
home base station which has a wired connection to a telecommunication
network, the relay only has a wireless connection with a base station or
a home base station and its connection to the telecommunication network
is done via the base station or the home base station.

[0019] Due to the constant coverage area size reduction and spectral
efficiency increase, the amount of home base stations and/or relays
becomes very important and situation may occur wherein classic ICIC
techniques cannot be used.

[0020] The present invention aims at providing a solution which enables
inter-cell interference coordination technique to be used in a wireless
cellular telecommunication network in which wireless telecommunication
devices like home base stations and/or relays are deployed.

[0021] To that end, the present invention concerns a method for
controlling the interferences generated by radio signals transferred by
or to wireless telecommunication devices of a wireless cellular
telecommunication network, characterised in that the method comprises the
steps of: [0022] forming at least one group of wireless
telecommunication devices, [0023] allocating at least one identifier to
each wireless telecommunication device of the group of wireless
telecommunication devices, the at least one identifier, said as group
identifier, being allocated to each wireless telecommunication device of
the group of wireless telecommunication devices, the group identifier
being intended to be transferred by each wireless telecommunication
device of the group of wireless telecommunication devices to mobile
terminals in parallel with another identifier which is not shared with
each wireless telecommunication device of the group of wireless
telecommunication devices, [0024] allocating the same parameters for
controlling the interferences generated by radio signals transferred to
or by each wireless telecommunication device of the group of wireless
telecommunication devices.

[0025] The present invention concerns also a device for controlling the
interferences generated by radio signals transferred by or to wireless
telecommunication devices of a wireless cellular telecommunication
network, characterised in that the device for controlling the
interferences comprises: [0026] means for forming at least one group of
wireless telecommunication devices, [0027] means for allocating at least
one identifier to each wireless telecommunication device of the group of
wireless telecommunication devices, the at least one identifier, said as
group identifier, being allocated to each wireless telecommunication
device of the group of wireless telecommunication devices, the group
identifier being intended to be transferred by each wireless
telecommunication device of the group of wireless telecommunication
devices to mobile terminals in parallel with another identifier which is
not shared with each wireless telecommunication device of the group of
wireless telecommunication devices, [0028] means for allocating the same
parameters for controlling the interferences generated by radio signals
transferred to or by each wireless telecommunication device of the group
of wireless telecommunication devices.

[0029] Thus, inter-cell interference coordination technique can be used in
a wireless cellular telecommunication network in which wireless
telecommunication devices like home base stations and/or relays are
deployed as each wireless telecommunication device of the group of
wireless telecommunication devices shares the same identifier and the
same parameters for controlling the interferences generated by radio
signals.

[0030] The mobile terminals served by base stations or home base stations
or a relay in the neighbourhood of a given base station can report
measures for the whole group, as if it were a single base station or
wireless telecommunication device. Thanks to the transmission of at least
two identifiers, the mobile terminals make reports for at least two
identifiers, at least one identifier corresponding to a true cell, in
which data communications happen and to which the mobile terminals are
likely to be handed over, and at least one other identifier, the group
identifier, corresponding to a fake cell, in which data communications do
not happen.

[0031] It is then easier for the neighbour base station or home base
station to handle the group as if it were a single base station or
wireless telecommunication device or cell or sector.

[0032] According to a particular feature, the group identifier and the
parameters for controlling the interferences generated by radio signals
form a couple of information, the couple of information being intended
for an uplink channel or for a downlink channel of the wireless
telecommunication device.

[0033] Thus, it is possible to control the interferences generated by
radio signals in the downlink channel or in the uplink channel according
to the group identifier. There is a direct relationship between the
parameters for controlling the interferences generated by radio signals
and the group identifier. Parameters for controlling the interferences
generated by radio signals can be changed by allocating a new group
identifier to a wireless telecommunication device. Parameters for
controlling the interferences generated by radio signals of a whole group
of wireless telecommunication devices can be modified by changing the
couple of information, associating new parameters for controlling the
interferences generated by radio signals to the group identifier of the
group of wireless telecommunication devices.

[0034] Since each couple, and thus each group identifier can be associated
to an uplink channel or a downlink channel, different parameters for
controlling the interferences generated by radio signals can be used in
the uplink channel and the downlink channel, together with different
groups of wireless telecommunication devices. Indeed, the interference
behaves differently in uplink and downlink channels and distinct ICIC
might be needed.

[0035] According to a particular feature, the method comprises further
steps of: [0036] receiving information representative of interferences
received by at least one mobile terminal and/or at least one wireless
telecommunication device and/or at least one base station, [0037]
determining from the information representative of interferences other
parameters for controlling the interferences generated by radio signals,
[0038] determining, from the other parameters for controlling the
interferences generated by radio signals, another group identifier to be
allocated to each wireless telecommunication device of at least a part of
the group of wireless telecommunication devices, [0039] transferring to
the at least part of the group of wireless telecommunication devices, the
other group identifier and/or the other parameters for controlling the
interferences generated by radio signals.

[0040] Thus, the parameters for controlling the interferences generated by
radio signals can evolve in the time, for example together with
installation or removal of base stations and/or home base stations and/or
relays.

[0041] The parameters for controlling the interferences generated by radio
signals of a given wireless telecommunication device can be changed by
changing its group identifier. If the wireless telecommunication device
already knows all possible couples of information formed by a group
identifier and corresponding parameters for controlling the interferences
generated by radio signals, the change can be done by signalling to the
wireless telecommunication device a new group identifier and the wireless
telecommunication device then deduces the new parameters for controlling
the interferences generated by radio signals.

[0042] Alternatively, the change can be done by signalling to the wireless
telecommunication device new parameters for controlling the interferences
generated by radio signals and the wireless telecommunication device then
deduces the new group identifier. If the wireless telecommunication
device does not know all couples of information, a new couple of
information can be signalled to it. The parameters for controlling the
interferences generated by radio signals of a whole group can also be
changed by changing a couple of information, i.e., by changing the
parameters for controlling the interferences generated by radio signals
associated to the group identifier of the group and broadcasting it in
the group.

[0043] Alternatively, the new parameters for controlling the interferences
generated by radio signals can be broadcasted in the group.

[0044] Alternatively, a new couple of information can be broadcasted in
the group.

[0045] Alternatively, all new couples of information can be broadcasted,
i.e. a list of all couples of information or part of them is stored and
updated in each wireless telecommunication device.

[0046] According to a particular feature, the method is executed by a base
station or a coordinator of the wireless cellular telecommunication
network.

[0047] Thus, the base station is able to coordinate the interferences
generated by radio signals transferred by or to wireless
telecommunication devices under its coverage area.

[0048] A coordinator may be able to coordinate the interferences generated
by radio signals transferred by or to wireless telecommunication devices
under the coverage of several base stations and be able to better
coordinate interferences generated by radio signals transferred by or to
wireless telecommunication devices at the boundaries of coverage areas of
base stations.

[0049] The present invention concerns also a method for controlling the
interferences generated by radio signals transferred by or to wireless
telecommunication devices of a wireless cellular telecommunication
network, characterised in that the method comprises the steps executed by
at least one wireless telecommunication device of: [0050] obtaining a
couple of information formed by a first identifier of the wireless
telecommunication device intended to be transferred by the wireless
telecommunication device base station to mobile terminals and by
parameters for controlling the interferences generated by radio signals
transferred by or to said wireless telecommunication device, [0051]
obtaining a second identifier of the wireless telecommunication device,
the second identifier being intended to be transferred by the wireless
telecommunication device, [0052] transferring the first and second
identifiers to mobile terminals, [0053] transferring radio signals
according to the parameters for controlling the interferences generated
by radio signals or transferring a message to at least one mobile
terminal, the message comprising information related to the parameters
for controlling the interferences generated by radio signals transferred
by the at least one mobile terminal.

[0054] The present invention concerns also a device for controlling the
interferences generated by radio signals transferred by or to wireless
telecommunication devices of a wireless cellular telecommunication
network, characterised in that the device for controlling the
interferences is included in a wireless telecommunication device and
comprises: [0055] means for obtaining a couple of information formed by
a first identifier of the wireless telecommunication device intended to
be transferred by the wireless telecommunication device base station to
mobile terminals and by parameters for controlling the interferences
generated by radio signals transferred by or to said wireless
telecommunication device, [0056] means for obtaining a second identifier
of the wireless telecommunication device, the second identifier being
intended to be transferred by the wireless telecommunication device,
[0057] means for transferring the first and second identifiers to mobile
terminals, [0058] means for transferring radio signals according to the
parameters for controlling the interference generated by radio signals or
transferring a message to at least one mobile terminal, the message
comprising information related to the parameters for controlling the
interference generated by radio signals transferred by the at least one
mobile terminal.

[0059] Thus, the wireless telecommunication device is able to set
appropriately its identifiers and the parameters for controlling the
interferences generated by radio signals transferred by or received by
the wireless telecommunication device according to a message received
from a base station or a coordinator or according to its own sounding of
its neighbourhood. This ability allows for adaptability of the ICIC and
of the groups of wireless telecommunication devices.

[0060] Thanks to the transmission of at least two identifiers, the mobile
terminals served by base stations or by home base stations or by relays
in the neighbourhood of a base station or a home base station or a relay
of the group can report measures for the whole group, as if it were a
single base station or wireless telecommunication device.

[0061] The mobile terminals make reports for at least two identifiers, at
least one identifier corresponding to a true cell, in which data
communications happen and to which the mobile terminals are likely to be
handed over, and at least one other identifier, the group identifier,
corresponding to a fake cell, in which data communications do not happen.

[0062] It is then easier for the neighbour base station or home base
station or relay to handle the group as if it were a single wireless
telecommunication device or cell.

[0063] According to a particular feature, the couple of information is
intended for an uplink channel or for a downlink channel of the wireless
telecommunication device.

[0064] Since each couple, and thus each identifier can be associated to an
uplink channel or a downlink channel, different parameters for
controlling the interferences generated by signals can be used in uplink
and downlink channels. Indeed, the interference behaves differently in
uplink and downlink and distinct ICIC might be needed.

[0065] According to a particular feature, the first identifier of the
wireless telecommunication device and/or the parameters for controlling
the interferences generated by radio signals transferred or received by
the wireless telecommunication device is obtained from a message
transferred by a coordinator of the wireless cellular telecommunication
network.

[0066] Thus, the ICIC is centralised at the coordinator, which is able to
collect information from different base stations and/or wireless
telecommunication devices. The coordinator can derive appropriate
parameters for controlling the interferences generated by radio signals
transferred or received by each wireless telecommunication device based
on at least this information and inform the wireless telecommunication
device.

[0067] According to a particular feature, the identifier of the wireless
telecommunication device and/or the parameters for controlling the
interferences generated by radio signals transferred or received by the
wireless telecommunication device is obtained from a message transferred
by a base station of the wireless cellular telecommunication network.

[0068] Thus, the base station is able to coordinate the interferences
generated by radio signals transferred by or to wireless
telecommunication devices under its coverage area.

[0069] According to a particular feature, at least two couples of
information are allocated to the wireless telecommunication device by at
least two different telecommunication devices and the wireless
telecommunication device: [0070] selects at least one of the received
couples of information, [0071] transfers at least the identifier of the
at least one selected couple of information to mobile terminals, [0072]
transfers radio signals according to one received set of parameters or to
a set of parameters derived from the at least two sets of parameters of
the received couples of information or transfers a message to at least
one mobile terminal comprising information related to one received set of
parameters or to a set of parameters derived from the at least two sets
of parameters of the received couples of information.

[0073] Thus, the wireless telecommunication device can belong to two
different groups with different parameters for controlling the
interferences generated by radio signals transferred or received by the
wireless telecommunication device, each group of wireless
telecommunication devices being determined by a telecommunication device
like a base station or a coordinator.

[0074] By selecting, for example, the more restrictive parameters, the
wireless telecommunication device ensures that the interferences will not
be higher than expected.

[0075] According to still another aspect, the present invention concerns
computer programs which can be directly loadable into a programmable
device, comprising instructions or portions of code for implementing the
steps of the methods according to the invention, when said computer
programs are executed on a programmable device.

[0076] Since the features and advantages relating to the computer programs
are the same as those set out above related to the methods and apparatus
according to the invention, they will not be repeated here.

[0077] The characteristics of the invention will emerge more clearly from
a reading of the following description of an example of embodiment, the
said description being produced with reference to the accompanying
drawings, among which:

[0078] FIG. 1 represents a wireless cellular telecommunication network in
which the present invention is implemented;

[0079]FIG. 2 is a diagram representing the architecture of a coordinator
in which the present invention is implemented;

[0080] FIG. 3 is a diagram representing the architecture of a base station
in which the present invention is implemented;

[0081]FIG. 4 is a diagram representing the architecture of a wireless
telecommunication device in which the present invention is implemented;

[0082]FIG. 5 discloses an example of an algorithm executed by the
coordinator or the base station according to a first mode of realisation
of the present invention;

[0083] FIG. 6 discloses an example of an algorithm executed by a wireless
telecommunication device when the coordinator executes the algorithm of
FIG. 5 according to the first mode of realisation of the present
invention;

[0084]FIG. 7 discloses an example of an algorithm executed by a wireless
telecommunication device according to a second mode of realisation of the
present invention;

[0085]FIG. 8 discloses an example of an algorithm executed by a wireless
telecommunication device when plural base stations and/or coordinators
execute the algorithm of FIG. 5 according to the first mode of
realisation of the present invention.

[0086] FIG. 1 represents a wireless cellular telecommunication network in
which the present invention is implemented.

[0087] In FIG. 1, two base stations BS1 and BS2 and eleven wireless
telecommunication devices HBS1 to HBS11 of a wireless cellular
telecommunication network are shown.

[0088] Two base stations BS1 and BS2 and eleven wireless telecommunication
devices HBS1 to HBS11 are shown but we can understand that the present
invention works when a different, e.g. more important, number of base
stations and/or wireless telecommunication devices exist in the wireless
cellular telecommunication network.

[0089] The wireless telecommunication devices HBS are for example located
at home.

[0090] The wireless telecommunication devices HBS may be for example home
base stations or relays or a combination of relays and home base
stations. Each home base station HBS may enable mobile terminals
associated to the home base station HBS to access the wireless cellular
telecommunication network.

[0091] Each relay may enable mobile terminals associated to the relay to
access the wireless cellular telecommunication network. For example,
relays transmit signals through a downlink channel to mobile terminals
and receive signals from mobile terminals through an uplink channel as if
they were classic base stations or home base stations. However, unlike a
base station or a home base station which has a wired connection to a
telecommunication network, the relay only has a wireless connection with
a base station or a home base station and its connection to the
telecommunication network is done via the base station or the home base
station.

[0092] The wireless telecommunication devices HBSi with i=1 to 11 are able
to receive signals transferred by mobile terminals which are located in
the cell they respectively manage. The wireless telecommunication devices
HBSi transfer signals which can be received and processed by mobile
terminals located in the cell they respectively manage.

[0093] The wireless telecommunication devices HBS1 to HBS5 are located in
the cell managed by the base station BS1.

[0094] The wireless telecommunication devices HBS6 to HBS11 are located in
the cell managed by the base station BS2.

[0095] A coordinator 10 may be included in the wireless cellular
telecommunication network. The coordinator 10 may control the ICIC
procedure and allocate group identifiers to wireless telecommunication
devices HB1 to HB11 according to the present invention.

[0096] The coordinator 10 may interface the wireless telecommunication
devices HBS with the remaining devices of the wireless cellular
telecommunication network.

[0097] According to the invention, wireless telecommunication devices HBSi
with i=1 to 11 are grouped into plural groups of wireless
telecommunication devices. Each wireless telecommunication device of a
group of wireless telecommunication devices shares the same common
identifier and the same set of parameters for controlling the
interferences generated by radio signals transferred to or by the
wireless telecommunication devices.

[0098] Parameters for controlling the interferences generated by radio
signals transferred to or by the wireless telecommunication devices are
determined according to an ICIC procedure.

[0099] For example, a part of the resource is reserved to cell-edge mobile
terminals. To this end, parameters for controlling the transmission power
pattern are defined and specify in which frequency band or bands the
transmit power should be higher and in which frequency band or bands the
transmit power should be lower. Parameters are defined in order to
provide a situation in which two neighbouring groups of wireless
telecommunication devices or a base station and one group of wireless
telecommunication devices comprising at least one wireless
telecommunication device which is neighbour of this base station have
different power transmission levels in different frequency bands.

[0100] The group of wireless telecommunication devices G1DL comprises the
wireless telecommunication devices HBS1, HBS2 and HBS3 which share the
same physical cell identity and which apply, in case no wireless
telecommunication device belongs to plural groups of wireless
telecommunication devices for downlink channel, the same parameters for
controlling the interferences generated by radio signals for downlink
communication.

[0101] The group of wireless telecommunication devices G1UL comprises the
wireless telecommunication devices HBS1 and HBS2 which share the same
physical cell identity and which apply, in case no wireless
telecommunication device belongs to plural groups of wireless
telecommunication devices for uplink channel, the same parameters for
controlling the interferences generated by radio signals for uplink
communication.

[0102] The group of wireless telecommunication devices G2DL comprises the
wireless telecommunication devices HBS4 and HBS5 which share the same
physical cell identity and which apply, in case no wireless
telecommunication device belongs to plural groups of wireless
telecommunication devices for downlink channel, the same parameters for
controlling the interferences generated by radio signals for downlink
communication.

[0103] The group of wireless telecommunication devices G2UL comprises the
wireless telecommunication devices HBS3, HBS4 and HBS5 which share the
same physical cell identity and which apply, in case no wireless
telecommunication device belongs to plural groups of wireless
telecommunication devices for uplink channel, the same parameters for
controlling the interferences generated by radio signals for uplink
communication.

[0104] The group of wireless telecommunication devices G3DL comprises the
wireless telecommunication devices HBS6, HBS7 and HBS8 which share the
same physical cell identity and which apply, in case no wireless
telecommunication device belongs to plural groups of wireless
telecommunication devices for downlink channel, the same parameters for
controlling the interferences generated by radio signals for downlink
communication.

[0105] The group of wireless telecommunication devices G3UL comprises the
wireless telecommunication devices HBS6 and HBS7 which share the same
physical cell identity and which apply, in case no wireless
telecommunication device belongs to plural groups of wireless
telecommunication devices for uplink channel, the same parameters for
controlling the interferences generated by radio signals for uplink
communication.

[0106] The group of wireless telecommunication devices G4DL comprises the
wireless telecommunication devices HBS9, HBS10 and HBS11 which share the
same physical cell identity and which apply, in case no wireless
telecommunication device belongs to plural groups of wireless
telecommunication devices for downlink channel, the same parameters for
controlling the interferences generated by radio signals for downlink
communication.

[0107] The group of wireless telecommunication devices G4UL comprises the
wireless telecommunication devices HBS8, HBS9, HBS10, HBS11 which share
the same physical cell identity and which apply, in case no wireless
telecommunication device belongs to plural groups of wireless
telecommunication devices for uplink channel, the same parameters for
controlling the interferences generated by radio signals for uplink
communication.

[0108] A group of wireless telecommunication devices may or may not be
geographically localized. The groups of wireless telecommunication
devices may be distributed in space, paving the space with groups of
wireless telecommunication devices and base stations.

[0109] For example the groups of wireless telecommunication devices may be
at first determined according to location information and may change as
it will be disclosed herein after.

[0110] According to the example of FIG. 1, each wireless telecommunication
device HBS transfers at least two physical cell identities, at least one
of the physical cell identities, i.e. a group identifier, is transferred
also by other wireless telecommunication devices belonging to the same
downlink group or uplink group. At least one physical cell identity is
not transferred by each wireless telecommunication device of the group of
wireless telecommunication devices, preferably not transferred by any
other wireless telecommunication device of the group of wireless
telecommunication devices.

[0111] The base stations BSj with j=1 to 2 and the coordinator 10 are
linked together by a communication network not shown in FIG. 1.

[0112] The wireless telecommunication devices HBSi, with i=1 to 11, may be
linked by the communication network if the wireless telecommunication
devices are home base stations.

[0114] According to the invention, each base station BS or the coordinator
10: [0115] forms at least one group of wireless telecommunication
devices, [0116] allocates at least one identifier to each wireless
telecommunication device of the group of wireless telecommunication
devices, the at least one identifier, said as group identifier being
allocated to each wireless telecommunication device of the group of
wireless telecommunication devices, the group identifier being intended
to be transferred by each wireless telecommunication device of the group
of wireless telecommunication devices to mobile terminals in parallel
with at least another identifier which is not shared with each wireless
telecommunication device of the group of wireless telecommunication
devices, [0117] allocates the same parameters for controlling the
interferences generated by radio signals transferred to or by each
wireless telecommunication device of the group of wireless
telecommunication devices.

[0118] According to the invention, at least one wireless telecommunication
device: [0119] obtains a couple of information formed by a first
identifier of the wireless telecommunication device intended to be
transferred by the wireless telecommunication device to mobile terminals
and by parameters for controlling the interferences generated by radio
signals transferred by or to the wireless telecommunication device,
[0120] obtains a second identifier of the wireless telecommunication
device, the second identifier being intended to be transferred by the
wireless telecommunication device, [0121] transfers the first and second
identifiers to mobile terminals, [0122] transfers radio signals according
to the parameters for controlling the interferences generated by radio
signals or transfers a message to at least one mobile terminal, the
message comprising information related to the parameters for controlling
the interferences generated by radio signals transferred by the at least
one mobile terminal.

[0123]FIG. 2 is a diagram representing the architecture of a coordinator
10 in which the present invention is implemented.

[0124] The coordinator 10 has, for example, an architecture based on
components connected together by a bus 201 and a processor 200 controlled
by the program as disclosed in FIG. 5.

[0125] It has to be noted here that, instead of being based on a
processor, the architecture of the coordinator may be based on dedicated
integrated circuits.

[0126] The bus 201 links the processor 200 to a read only memory ROM 202,
a random access memory RAM 203 and a network interface 206.

[0127] The memory 203 contains registers intended to receive variables and
the instructions of the program related to the algorithm as disclosed in
FIG. 5.

[0128] The processor 200 controls the operation of the network interface
206.

[0129] The read only memory 202 contains instructions of the program
related to the algorithm as disclosed in FIG. 5, which are transferred,
when the coordinator 10 is powered on, to the random access memory 203.

[0130] The coordinator 10 is connected to a telecommunication network
through the network interface 206. For example, the network interface 206
is a DSL (Digital Subscriber Line) modem, or an ISDN (Integrated Services
Digital Network) interface, etc.

[0131] Through the network interface 206, the coordinator 10 may transfer
messages to wireless telecommunication devices or to base stations BS of
the wireless cellular telecommunication network or to core devices of the
wireless cellular telecommunication network not shown in FIG. 1.

[0132] FIG. 3 is a diagram representing the architecture of a base station
in which the present invention is implemented.

[0133] The base station BS has, for example, an architecture based on
components connected together by a bus 301 and a processor 300 controlled
by the program as disclosed in FIG. 5.

[0134] It has to be noted here that, instead of being based on a
processor, the architecture of the base station BS may be based on
dedicated integrated circuits.

[0135] The bus 301 links the processor 300 to a read only memory ROM 302,
a random access memory RAM 303, a wireless interface 305 and a network
interface 306.

[0136] The memory 303 contains registers intended to receive variables and
the instructions of the program related to the algorithm as disclosed in
FIG. 5.

[0137] The processor 300 controls the operation of the network interface
306 and of the wireless interface 305.

[0138] The read only memory 302 contains instructions of the program
related to the algorithms as disclosed in FIG. 5, which are transferred,
when the base station BS is powered on, to the random access memory 303.

[0139] The base station BS may be connected to a telecommunication network
through the network interface 306. For example, the network interface 306
is a DSL (Digital Subscriber Line) modem, or an ISDN (Integrated Services
Digital Network) interface, etc.

[0140] Through the network interface 306, the base station BS may transfer
messages to other base stations BS or to wireless telecommunication
devices HBS or to the coordinator 10 or to core devices of the wireless
cellular telecommunication network.

[0141] The wireless interface 305 and the network interface 306 are the
resources of the base station BS that may be used by a mobile terminal in
order to access the wireless cellular telecommunication network when the
mobile terminal establishes or receives a communication with a remote
telecommunication device.

[0143]FIG. 4 is a diagram representing the architecture of a wireless
telecommunication device in which the present invention is implemented.

[0144] The wireless telecommunication device HBS has, for example, an
architecture based on components connected together by a bus 401 and a
processor 400 controlled by the program as disclosed in FIG. 6 or 7 or 8.

[0145] It has to be noted here that, instead of being based on a
processor, the architecture of the wireless telecommunication device HBS
may be based on dedicated integrated circuits.

[0146] The bus 401 links the processor 400 to a read only memory ROM 402,
a random access memory RAM 403, a wireless interface 405 and a network
interface 406.

[0147] The memory 403 contains registers intended to receive variables and
the instructions of the program related to the algorithm as disclosed in
FIG. 6 or 7 or 8.

[0148] The processor 400 controls the operation of the network interface
406 and of the wireless interface 405.

[0149] The read only memory 402 contains instructions of the program
related to the algorithm as disclosed in FIG. 6 or 7 or 8, which are
transferred, when the wireless telecommunication device HBS is powered
on, to the random access memory 403.

[0150] If the wireless telecommunication device HBS is a home base
station, the wireless telecommunication device HBS may be connected to a
telecommunication network through the network interface 406. For example,
the network interface 406 is a DSL (Digital Subscriber Line) modem, or an
ISDN (Integrated Services Digital Network) interface, etc.

[0151] Through the network interface 406, the home base station HBS may
transfer messages to other base stations BS or to home base stations HBS
or to the coordinator 10.

[0152] The wireless interface 405 and the network interface 406 are the
resources of the home base station HBS that may be used by a mobile
terminal in order to access the wireless cellular telecommunication
network when the mobile terminal establishes or receives a communication
with a remote telecommunication device.

[0153] If the wireless telecommunication device HBS is a home base
station, the wireless interface 405 comprises a downlink transmission
module and an uplink reception module.

[0154] If the wireless telecommunication device HBS is a relay, the
wireless interface 405 comprises a downlink reception module and an
uplink transmission module for the transfer of signals between the relay
and a base station BS. The wireless interface 405 further comprises a
downlink transmission module and an uplink reception module for the
transfer of signals between the relay and mobile terminals.

[0155]FIG. 5 discloses an example of an algorithm executed by the
coordinator or the base station according to a first mode of realisation
of the present invention.

[0156] More precisely, the present algorithm is executed by the processor
200 of the coordinator 10 or by the processor 300 of each base station
BS1 or BS2.

[0157] The present algorithm will be disclosed when it is executed by the
processor 200 of the coordinator 10.

[0158] At step S500, the processor 200 forms a group of wireless
telecommunication devices HBS. The group of wireless telecommunication
devices may be formed using the location information of the wireless
telecommunication devices HBS.

[0159] At step S501, the processor 200 detects the reception, through the
network interface 206, of information related to interferences measured
by the mobile terminals and/or by the base station BS1 or BS2 and/or by
wireless telecommunication devices.

[0160] Information related to interferences are for example the power
strength of signals transferred by or to neighbour base stations or by or
to at least one group of wireless telecommunication devices, each
identified by a physical cell identity, and received by mobile terminals
and/or base stations BS and/or wireless telecommunication devices HBS.

[0161] Each mobile terminal transfers a message comprising information
related to interferences to the base station which is currently serving
it.

[0162] The message is used as such by the serving base station BS when it
executes the present algorithm or is transferred by the serving base
station BS to the coordinator 10 or is processed by the serving base
station BS and the result of the process is transferred to the
coordinator 10.

[0163] At next step S502, the processor 200 determines a set of ICIC
parameters for the group of wireless telecommunication devices identified
at step S500.

[0164] For example, ICIC procedure reserves a part of the resource to
cell-edge mobile terminals.

[0165] To this end, a power pattern is defined for each base station BS or
group of wireless telecommunication devices HBS, where the maximum
transmit power to be used by each mobile terminal for uplink transmission
with the base station BS or with a wireless telecommunication device HBS
of group of wireless telecommunication devices HBS and/or by the base
station or by the wireless telecommunication devices HBS of the group of
wireless telecommunication devices for downlink transmission in a given
frequency resource varies.

[0166] This pattern changes from one base station BS or one group of
wireless telecommunication devices HBS to another. For example, two
neighbouring base stations BS and/or groups of wireless telecommunication
devices HBS have different patterns.

[0167] The ICIC parameters are then optimized depending on the level of
interference mobile terminals suffer from or create.

[0168] In a variant, the processor 200 determines a set of ICIC parameters
for each wireless telecommunication device HBS the processor 200 is aware
of the existence or for each wireless telecommunication device HBS
comprised in a group of wireless telecommunication devices and may modify
the group of wireless telecommunication devices according to the
determined sets of ICIC parameters.

[0169] At next step S503, the processor 200 determines one common physical
cell identity, named group identifier, to be commonly transferred by the
wireless telecommunication devices of the group of wireless
telecommunication devices.

[0170] According to a particular feature of the present invention, a
physical cell identity corresponds to one set of ICIC parameters.

[0171] Among the five hundred and four physical cell identities, some of
them, for example twenty of them are reserved for groups of home base
stations and each of them corresponds to a set of ICIC parameters for
uplink channel or a set of ICIC parameters for downlink channel.

[0172] At next step S504, the processor 200 may determine one other
physical cell identity for each wireless telecommunication device HBS of
the group of wireless telecommunication devices. In a variant, the other
physical cell identity is determined by a core network device of the
wireless cellular telecommunication network or by each wireless
telecommunication device HBS.

[0173] Each other physical cell identity allocated to a wireless cellular
telecommunication device is not shared with each wireless
telecommunication device of the group of wireless telecommunication
devices.

[0174] At next step S505, the processor 200 allocates the set of ICIC
parameters determined at step S502 and which corresponds to the group
identifier determined for the group of wireless telecommunication
devices.

[0175] At next step S506, the processor 200 checks if the set or sets of
ICIC parameters determined at step S502 are different from the previous
set of ICIC parameters determined for the group of wireless
telecommunication devices.

[0176] If the set or sets of ICIC parameters determined at step S502 are
different from the previous set of ICIC parameters, the processor 200
moves to step S507. Otherwise, the processor 200 interrupts the present
algorithm.

[0177] At step S507, the processor 200 informs at least one wireless
telecommunication device of the group of wireless telecommunication
devices.

[0178] The processor 200 may transfer to each wireless telecommunication
device the physical cell identity determined at step S504.

[0179] The processor 200 may command the transfer of a message comprising
the group identifier determined at step S503 to each wireless
telecommunication device of the group of wireless telecommunication
devices and/or may command the transfer of a message comprising the set
of ICIC parameters allocated at step S505 to each wireless
telecommunication device of the group of wireless telecommunication
devices.

[0180] The processor 200 may command the transfer of a message comprising
the group identifier determined at step S503 to one or more wireless
telecommunication devices HBS of the group of wireless telecommunication
devices, the one or more wireless telecommunication devices HBS being
then switched to another group of wireless telecommunication devices
sharing the same group identifier and/or may command the transfer of a
message comprising the set of ICIC parameters allocated at step S504 to
one or more wireless telecommunication devices HBS of the group of
wireless telecommunication devices, the wireless telecommunication device
HBS being then switched to another group of wireless telecommunication
devices sharing the same set of ICIC parameters and thus the same group
identifier.

[0181] The processor 200 may command the transfer of a message comprising
the group identifier determined at step S503 to one or more wireless
telecommunication devices of the group of wireless telecommunication
devices, the message further comprising the set of ICIC parameters
allocated at step S504 to one or more wireless telecommunication devices
HBS of the group of wireless telecommunication devices.

[0182] By doing so, the processor 200 modifies the groups of wireless
telecommunication devices in order to improve the interference levels of
wireless telecommunication devices HBS among the groups of wireless
telecommunication devices.

[0183] After that, the processor 200 interrupts the present algorithm.

[0184] FIG. 6 discloses an example of an algorithm executed by a wireless
telecommunication device when the coordinator executes the algorithm of
FIG. 5 according to the first mode of realisation of the present
invention.

[0185] More precisely, the present algorithm is executed by the processor
400 of each wireless telecommunication device HBS.

[0186] According to the invention, each wireless telecommunication device
HBS transfers to mobile terminals at least a first and a second
identifiers. The first identifier, named group identifier, is transferred
by each wireless telecommunication device HBS of a group of wireless
telecommunication devices and the second identifier is not transferred by
each wireless telecommunication device HBS of the group of wireless
telecommunication devices.

[0187] At step S600, the processor 200 obtains the second identifier which
has been allocated by the coordinator 10 or by a core network device of
the wireless cellular telecommunication network.

[0188] At step S601, the processor 400 checks if a message comprising a
new group identifier is received from the coordinator 10.

[0189] If a message comprising a new group identifier is received, the
processor 400 moves to step S602. Otherwise, the processor 400 moves to
step S603.

[0190] At step S602, the processor 400 updates the couple of information
to be used by the wireless telecommunication device.

[0191] The couple of information comprises the group identifier which is
transferred to mobile terminals through the wireless interface 405 and
the set of ICIC parameters to be used for transferring signals on the
downlink channel.

[0192] According to a particular feature, the processor 400 uses the new
group identifier as a key in a look-up table stored in memory 403 in
order to get the new set of ICIC parameters.

[0193] At next step S603, the processor 400 checks if a message comprising
a new set of ICIC parameters is received from the coordinator 10 or if
the message processed at step S601 further comprises a new set of ICIC
parameters.

[0194] If a message comprising a new set of ICIC parameters is received
from the coordinator 10 or if the message processed at step S601 further
comprises a new set of ICIC parameters, the processor 400 moves to step
S604. Otherwise, the processor 400 moves to step S605.

[0195] At step S604, the processor 400 updates the couple of information
to be used by the wireless telecommunication device HBS.

[0196] The couple of information comprises the set of ICIC parameters to
be used for transferring signals on the downlink channel or on the uplink
channel and the group identifier which is transferred to mobile terminals
through the wireless interface 405.

[0197] According to a particular feature, the processor 400 uses the new
set of ICIC parameters as a key in a look-up table stored in memory 403
in order to get the new group identifier or get the group identifier from
the received message.

[0198] At next step S605, the processor 400 commands the transfer of the
group identifier and of the second physical cell identity through the
wireless interface 405.

[0199] The group identifier and the second physical cell identity are
transferred in parallel.

[0200] The second physical cell identity is transferred together with
associated pilot symbols and data. For example, the structure of pilots
and the scrambling of data is linked to the second physical cell
identity.

[0201] The group identifier may be transferred together with associated
pilot symbols. For example, the structure of pilots is linked to the
group identifier. The group identifier is not transferred together with
associated data, except some system information like a cell global
identity if needed. It means that the cell the group identifier
represents, is not a true cell, to which a mobile terminal may be handed
over and through which a mobile terminal can access to the wireless
cellular telecommunication network. However, all or part of the
aforementioned identifiers, pilots and data may be transferred in a
superimposed way, i.e. at the same time and on the same frequency
resources.

[0202] It has to be noted here that, the transmission power of the group
identifier may be lower than the transmission power of the second
physical cell identity.

[0203] As plural wireless telecommunication devices transfer the group
identifier, the reception power at mobile terminal is increased.

[0204] At next step S606, the processor 400 commands the wireless
interface 405 in order to apply the set of ICIC parameters for
transferring signals on the downlink channel or commands the transfers of
information related to the set of ICIC parameters to be used by mobile
terminals served by the wireless telecommunication device HBS for
transferring signals.

[0205] After that, the processor 400 interrupts the present algorithm.

[0206]FIG. 7 discloses an example of an algorithm executed by a wireless
telecommunication device according to a second mode of realisation of the
present invention.

[0207] According to the second mode of realisation, the determination of
the belonging of a wireless telecommunication device HBS in a group of
wireless telecommunication devices is executed in a distributed manner,
i.e. by each wireless telecommunication device HBS.

[0208] More precisely, the present algorithm is executed by the processor
400 of each wireless telecommunication device HBS.

[0209] At step S700, the processor 400 commands the wireless interface 405
in order to scan the signals received from neighbouring wireless
telecommunication devices HBS and/or neighbouring base stations BS.

[0211] At next step S701, the processor 400 selects one physical cell
identity, named group identifier for the wireless telecommunication
device HBS.

[0212] According to a particular feature, each possible physical cell
identities that may be allocated to a group of wireless telecommunication
devices is memorised in the RAM memory 403.

[0213] The processor 400 selects a physical cell identity according to the
physical cell identities detected by the wireless interface 405.
According to a variant, the processor 400 selects the same physical cell
identity as neighbours from possible physical cell identities that may be
allocated to a group of wireless telecommunication devices.

[0214] According to another variant, the processor 400 selects a physical
cell identity identities which is or are not detected from possible
physical cell identities that may be allocated to a group of wireless
telecommunication devices, in order to use different patterns as
neighbouring wireless telecommunication devices HBS and then reduce
wireless telecommunication device HBS to wireless telecommunication
device HBS interferences.

[0215] For example, if no physical cell identity is detected from possible
physical cell identities that may be allocated to a group of wireless
telecommunication devices, the processor 400 selects a physical cell
identity randomly among possible physical cell identities that may be
allocated to a group of wireless telecommunication devices.

[0216] At next step S702, the processor 400 updates if needed the set of
ICIC parameters to be used for transferring signals on the downlink
channel or on the uplink channel.

[0217] The processor 400 uses the physical cell identity as a key in a
look-up table stored in memory 403 in order to get the set of ICIC
parameters.

[0218] At next step S703, the processor 400 obtains a second physical cell
identity to be transferred by the wireless cellular telecommunication
device HBS to mobile terminals. The second physical cell identity is for
example received from the coordinator 10 or from one base station HBS or
from a core network device of the wireless cellular telecommunication
network or selected by the wireless cellular telecommunication device HBS
and memorized in the RAM memory 403.

[0219] The second physical cell identity is different from the second
physical cell identity allocated to at least one wireless
telecommunication sharing the same group identifier.

[0220] The second physical cell identity may be different from the second
physical cell identity allocated to each other wireless telecommunication
sharing the same group identifier.

[0221] At next step S704, the processor 400 commands the transfer of the
group identifier and of the second physical cell identity through the
wireless interface 405.

[0222] The group identifier and the second physical cell identity are
transferred in parallel.

[0223] The second physical cell identity is transferred together with
associated pilot symbols and data. For example, the structure of pilots
and the scrambling of data is linked to the physical cell identity.

[0224] The group identifier may be transferred together with associated
pilot symbols. For example, the structure of pilots symbols is linked to
the group identifier. The group identifier is not transferred together
with associated data, except some system information like a cell global
identity if needed. It means that the cell the group identifier
represents, is not a true cell, to which a mobile terminal may be handed
over and through which a mobile terminal can access to the wireless
cellular telecommunication network. However, all or part of the
aforementioned identifiers, pilots and data may be transferred in a
superimposed way, i.e., at the same time and on the same frequency
resources.

[0225] At the same step, the processor 400 commands the wireless interface
405 in order to apply the set of ICIC parameters for transferring signals
on the downlink channel or commands the transfers of information related
to the set of ICIC parameters to be used by mobile terminals HBS for
transferring signals.

[0226] After that, the processor 400 interrupts the present algorithm.

[0227]FIG. 8 discloses an example of an algorithm executed by a wireless
telecommunication device when plural base stations and/or coordinators
execute the algorithm of FIG. 5 according to the first mode of
realisation of the present invention.

[0228] When each base station executes the algorithm of FIG. 5 or one
coordinator 10 and one base station BS the algorithm of FIG. 5 or when
two coordinators 10 execute the algorithm of FIG. 5, sometimes two group
identifiers may be allocated to a wireless telecommunication device for
the same downlink or uplink channel.

[0229] As there is a strong relationship between a group identifier and a
set of ICIC parameters, a wireless telecommunication device HBS may be
requested to use two different sets of ICIC parameters by two different
telecommunication devices like base station BS or coordinator 10.

[0230] More precisely, the present algorithm is executed by the processor
400 of each home base station HBS.

[0231] According to the invention, each wireless telecommunication device
HBS transfers to mobile terminals at least a first and a second
identifiers. The first identifier, named group identifier, is transferred
by each wireless telecommunication device HBS of a group of wireless
telecommunication devices and the second identifier is not transferred by
each wireless telecommunication device HBS of the group of wireless
telecommunication devices.

[0232] At step S800, the processor 200 obtains the second identifier which
has been allocated by the coordinator 10 or by a base station BS or by a
core network device of the wireless cellular telecommunication network or
by the wireless telecommunication device HBS.

[0233] At step S801, the processor 400 checks if a message comprising a
new group identifier is received from the coordinator 10.

[0234] If a message comprising a new group identifier is received, the
processor 400 moves to step S802. Otherwise, the processor 400 moves to
step S806.

[0235] At step S802, the processor 400 updates the couple of information
to be used by the wireless telecommunication device.

[0236] The couple of information comprises the group identifier which is
transferred to mobile terminals through the wireless interface 405 and
the set of ICIC parameters to be used for transferring signals on the
downlink channel or on the uplink channel.

[0237] According to a particular feature, the processor 400 uses the new
group identifier as a key in a look-up table stored in memory 403 in
order to get the new set of ICIC parameters.

[0238] At next step S803, the processor 400 checks if at least two
telecommunication devices like a base station BS or a coordinator 10 have
transferred a message comprising a group identifier which corresponds to
a same downlink or uplink channel.

[0239] If at least two telecommunication devices have transferred a
message comprising a group identifier which corresponds to a same
downlink or uplink channel, the processor 400 moves to step S804.
Otherwise, the processor 400 moves to step S806.

[0240] At next step S804, the processor 400 obtains the sets of ICIC
parameters which correspond to the group identifiers transferred by
different telecommunication devices and which correspond to the same
downlink or uplink channel.

[0241] The processor 400 may use the group identifiers as a key in a
look-up table stored in memory 403 in order to get the sets of ICIC
parameters.

[0242] The processor 400 selects a set of ICIC parameters which guarantees
all constraints expected from the at least two sets of ICIC parameters.

[0243] For example, the processor 400 selects among the at least two sets
of ICIC parameters, the one which corresponds to a minimum transmission
power. The processor 400 may select, for each frequency band, the lowest
transmission power among the at least two indicated for the frequency
band in the sets of ICIC parameters.

[0244] After that, the processor 400 moves to step S806.

[0245] If there is no look-up table in memory 403, the processor 400 moves
from step S803 to step S806.

[0246] At next step S806, the processor 400 checks if a message comprising
a new set of ICIC parameters is received from the coordinator 10 or if
the message processed at step S801 further comprises a new set of ICIC
parameters.

[0247] If a message comprising a new set of ICIC parameters is received
from the coordinator 10 or if the message processed at step S801 further
comprises a new set of ICIC parameters, the processor 400 moves to step
S807. Otherwise, the processor 400 moves to step S810.

[0248] At next step S807, the processor 400 checks if at least two
telecommunication devices have transferred a message comprising a set of
ICIC parameters or if a telecommunication device has transferred a set of
ICIC parameters which does not correspond to a group identifier
transferred by another telecommunication device for a same downlink or
uplink channel.

[0249] If at least two telecommunication devices have transferred a
message comprising a set of ICIC parameters or if a telecommunication
device has transferred a set of ICIC parameters which does not correspond
to a group identifier transferred by another telecommunication device for
a same downlink or uplink channel, the processor 400 moves to step S808.
Otherwise, the processor 400 moves to step S809.

[0250] At next step S808, the processor 400 obtains the at least two sets
of ICIC parameters which correspond to the same downlink or uplink
channel.

[0251] The processor 400 selects a set of ICIC parameters which guarantees
all constraints expected from the at least two sets of ICIC parameters.
For example, the processor 400 selects among the at least two sets of
ICIC parameters, the one which corresponds to a minimum transmission
power. The processor 400 may select, for each frequency band, the lowest
transmission power among the at least two indicated for the frequency
band in the sets of ICIC parameters.

[0252] After that, the processor 400 moves to step S810.

[0253] At step S809, the processor 400 updates each couple of information
to be used by the wireless telecommunication device.

[0254] If two telecommunication devices like a base station BS or a
coordinator 10 have transferred a message comprising a group identifier
which corresponds to a same downlink or uplink channel, the processor 400
memorises a first couple of information comprising one received group
identifier and the set of ICIC parameters determined at step S804 or S808
and memorises a second couple of information comprising another received
group identifier and the set of ICIC parameters determined at step S804
or S808.

[0255] At next step S810, the processor 400 commands the transfer of at
least one group identifier and of the second physical cell identity
through the wireless interface 405.

[0256] The or each group identifier may be transferred together with
associated pilot symbols. The or each group identifier is not transferred
together with associated data. It means that the cell that the group
identifier represents, is not a true cell, to which a mobile terminal may
be handed over and through which a mobile terminal can access to the
wireless cellular telecommunication network. However, all or part of the
aforementioned identifiers, pilots and data may be transferred in a
superimposed way, i.e. at the same time and on the same frequency
resources.

[0257] It has to be noted here that the transmission power of the group
identifier or identifiers may be lower than the transmission power of the
second physical cell identity.

[0258] As plural wireless telecommunication devices transfer the same
group identifier, the reception power at mobile terminal is increased.

[0259] At next step S811, the processor 400 commands the wireless
interface 405 in order to apply the set of ICIC parameters for
transferring signals on the downlink channel or commands the transfers of
information related to the set of ICIC parameters to be used by mobile
terminals HBS for transferring signals.

[0260] After that, the processor 400 interrupts the present algorithm.

[0261] Naturally, many modifications can be made to the embodiments of the
invention described above without departing from the scope of the present
invention.

Patent applications by Loic Brunel, Rennes Cedex 7 FR

Patent applications by Nicolas Gresset, Rennes Cedex 7 FR

Patent applications by Mitsubishi Electric Corporation

Patent applications in class Noise, distortion, or singing reduction

Patent applications in all subclasses Noise, distortion, or singing reduction